move chainconfig to its own tag-protected file

cmd/keeper/README.md

@@ -12,12 +12,16 @@ It then executes the block statelessly and validates that the computed state roo
 
 ## Architecture
 
-The keeper uses build tags to compile platform-specific input methods:
+The keeper uses build tags to compile platform-specific input methods and chain configurations:
 
 ```
 cmd/keeper/
 ├── main.go                    # Main execution logic
-├── getpayload_example.go     # Example implementation
+├── getpayload_example.go      # Example implementation with embedded data
+├── getpayload_ziren.go        # Ziren zkVM implementation
+├── chainconfig_mainnet.go     # Mainnet chain configuration
+├── chainconfig_sepolia.go     # Sepolia chain configuration
+├── chainconfig_hoodi.go       # Hoodi chain configuration
 └── README.md                  # This file
 ```
 
@@ -66,7 +70,14 @@ func getInput() []byte {
 ### 2. Build for Your Platform
 
 ```bash
-go build -tags myplatform ./cmd/keeper
+# Build with specific platform and chain configuration
+go build -tags "myplatform mainnet" ./cmd/keeper
+
+# Available chain configurations:
+# - mainnet: Ethereum mainnet
+# - sepolia: Sepolia testnet
+# - hoodi: Hoodi testnet
+# If no chain tag is specified, defaults to mainnet
 ```
 
 ## Payload Structure
@@ -80,10 +91,24 @@ type Payload struct {
 }
 ```
 
-## Example Implementation
+## Build Examples
 
-See `getinput_example.go` for a complete example that contains a payload. To build the example:
+### Example Implementation
+See `getpayload_example.go` for a complete example with embedded Hoodi block data:
 
 ```bash
-go build -tags example ./cmd/keeper
+# Build example with different chain configurations
+go build -tags "example hoodi" ./cmd/keeper    # Example with Hoodi config (default for example)
+go build -tags "example mainnet" ./cmd/keeper  # Example with mainnet config
+go build -tags "example sepolia" ./cmd/keeper  # Example with Sepolia config
+```
+
+### Ziren zkVM Implementation
+Build for the Ziren zkVM platform:
+
+```bash
+# For MIPS architecture (typical for zkVM)
+GOOS=linux GOARCH=mipsle GOMIPS=softfloat go build -tags "ziren mainnet" ./cmd/keeper
+GOOS=linux GOARCH=mipsle GOMIPS=softfloat go build -tags "ziren sepolia" ./cmd/keeper
+GOOS=linux GOARCH=mipsle GOMIPS=softfloat go build -tags "ziren hoodi" ./cmd/keeper
 ```

cmd/keeper/chainconfig_hoodi.go

@@ -0,0 +1,26 @@
+// Copyright 2025 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+//go:build hoodi
+
+package main
+
+import "github.com/ethereum/go-ethereum/params"
+
+// getChainConfig returns the Hoodi testnet chain configuration.
+func getChainConfig() *params.ChainConfig {
+	return params.HoodiChainConfig
+}

cmd/keeper/chainconfig_mainnet.go

@@ -0,0 +1,26 @@
+// Copyright 2025 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+//go:build !hoodi && !sepolia
+
+package main
+
+import "github.com/ethereum/go-ethereum/params"
+
+// getChainConfig returns the Ethereum mainnet chain configuration.
+func getChainConfig() *params.ChainConfig {
+	return params.MainnetChainConfig
+}

cmd/keeper/chainconfig_sepolia.go

@@ -0,0 +1,26 @@
+// Copyright 2025 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+//go:build sepolia
+
+package main
+
+import "github.com/ethereum/go-ethereum/params"
+
+// getChainConfig returns the Sepolia testnet chain configuration.
+func getChainConfig() *params.ChainConfig {
+	return params.SepoliaChainConfig
+}

cmd/keeper/getpayload_example.go

@@ -26,7 +26,6 @@ import (
 	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/ethereum/go-ethereum/core/stateless"
 	"github.com/ethereum/go-ethereum/core/types"
-	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/rlp"
 )
 
@@ -64,9 +63,6 @@ var witnessRlp []byte
 //go:embed 1192c3_block.rlp
 var blockRlp []byte
 
-func getChainConfig() *params.ChainConfig {
-	return params.HoodiChainConfig
-}
 
 // getInput is a platform-specific function that will recover the input payload
 // and returns it as a slice. It is expected to be an RLP-encoded Payload structure

cmd/keeper/getpayload_ziren.go

@@ -20,13 +20,8 @@ package main
 
 import (
 	zkruntime "github.com/zkMIPS/zkMIPS/crates/go-runtime/zkm_runtime"
-	"github.com/ethereum/go-ethereum/params"
 )
 
-func getChainConfig() *params.ChainConfig {
-	return params.MainnetChainConfig
-}
-
 // getInput reads the input payload from the zkVM runtime environment.
 // The zkVM host provides the RLP-encoded Payload structure containing
 // the block and witness data through the runtime's input mechanism.

cmd/keeper/stubs.go

@@ -18,8 +18,6 @@
 
 package main
 
-import "github.com/ethereum/go-ethereum/params"
-
 // getInput is a stub implementation for when no platform-specific build tags are set.
 // This allows golangci-lint to typecheck the code without errors.
 // The actual implementations are provided in platform-specific files.
@@ -27,11 +25,3 @@ func getInput() []byte {
 	// This is a no-op stub - real implementations are in platform-specific files
 	return nil
 }
-
-// getChainConfig is a stub implementation for when no platform-specific build tags are set.
-// This allows golangci-lint to typecheck the code without errors.
-// The actual implementations are provided in platform-specific files.
-func getChainConfig() *params.ChainConfig {
-	// This is a no-op stub - real implementations are in platform-specific files
-	return nil
-}